Yii2 translating data stored in database

I’m working with Yii2 Framework, and already configured i18n component using this guide:
http://thecodeninja.net/2014/12/i18n-with-yii-2-advanced-template/

So, I can now translate strings within my php files using Yii::t() function. Translatable strings are extracted using $ ./yii message/extract console command, which generates proper translation files.

I now need to display translations for strings stored in the database.

I could use Yii:t() with a variable instead of a string as an argument like this

echo Yii:t('app', $some_string_from_db );

and make a new php file with some code like this

<?php 

function dbStringsToTranslate() {
    $o = Yii::t('app','db english string 1'); 
    $o.= Yii::t('app','db english string 2'); 
    $o.= Yii::t('app','db english string 3'); 
    return $o;
} 

This way $ ./yii message/extract command will find the needed translations.

This is working Ok, but of course $ ./yii message/extract is throwing some warnings anywhere I use Yii:t() with variables.

Skipping line 39. Make sure both category and message are static strings.

I think this is not a big deal, but well, here is my question:

Is this a right way to translate strings stored in a database?

Is there a better way to accomplish this?

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